what is the meaning of sailed single handed?

[Umbrella]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #84 "Improving Verbal Skills", question 3

He ......... to have sailed single-handed round the world but personally I don't believe him.

(a) says
(b) believes
(c) claims
(d) intends

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #84 "Improving Verbal Skills", answer 3

He claims to have sailed single-handed round the world but personally I don't believe him.

Correct answer: (c) claims
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what is the meaning of sailed single handed?

Umbrella

[Mister Micawber]

.
He took a sailboat alone.
.
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Native English teacher at Mister Micawber's

[Ahmadov]

I thought it meant he sailed using only one hand as he had a problem in the other hand of him... LOL...
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Learning is a sacred engagement.